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Paper Information

Title: 

APPLIED TECHNICAL PROPOSAL FOR PLANNING, DESIGN AND INSTALLATION OF OFFSHORE WIND FARMS SUITABLE FOR PERSIAN GULF, OMAN SEA AND CASPIAN SEA

Type: PAPER
Author(s): SADEGHI KABIR,ALEALI SEYED ALIREZA
 
 
 
Name of Seminar: INTERNATIONAL CONFERENCE ON COASTS, PORTS AND MARINE STRUCTURES (ICOPMAS) PORTS & MARITIME ORGANIZATION
Type of Seminar:  CONFERENCE
Sponsor:  PORTS AND MARITIME ORGANIZATION
Date:  2008Volume 8
 
 
Abstract: 

WINDS ARE MORE AVAILABLE AND POWERFUL IN OFFSHORE THAN IN LAND BECAUSE THERE ARE NO OBSTACLES TO REDUCE POWER OF THE WIND, BESIDES SOUND NOISE, VISUAL DAMAGES AND THE ENVIRONMENTAL IMPACTS ARE USUALLY MINIMIZED IN OFFSHORE.
IRAN BEING A COUNTRY WITH VERY LONG COASTLINES AND HAVING MORE THAN 150 INSTALLED OFFSHORE PLATFORMS HAS THE POTENTIAL TO DEVELOP ITS OFFSHORE WIND RESOURCE.
IN THIS PAPER A BRIEF OVERVIEW OF OFFSHORE WIND FARM IS PRESENTED. ADVANTAGES, DIFFERENT TYPES OF TOWER AND FOUNDATION, MAIN COMPONENTS OF THE SYSTEM, ENGINEERING ASPECTS SUCH AS RELATION BETWEEN WIND SPEED AND EXTRACTED POWER, MAIN POINTS OF TOWER DESIGN AND ALSO THE PLANNING AND MANAGEMENT ASPECT AND NEEDED FEASIBILITY STUDY ARE SUBMITTED.
5 YEAR WIND DATA FOR BOUSHEHR, KISH, SIRI, ABOUMOUSA, KONARAK, CHABAHAR, ANZALI AND NOUSHAHR ARE ANALYZED AND COMPARED WITH THE MINIMUM WIND SPEED REQUIRED FOR WIND FARMS.
THIS ANALYSES SHOW THAT INSTALLATION OF OFFSHORE WIND FARMS IN THE PERSIAN GULF IS STRONGLY RECOMMENDED. FURTHER INVESTIGATION FOR WIND POTENTIAL OF OMAN SEA IS NEEDED, AS DATA PRESENTED IN THIS PAPER SHOW THAT THE WIND SPEEDS ARE SLIGHTLY ABOVE MINIMUM REQUIREMENT. FOR CASPIAN SEA IT IS NOT RECOMMENDED BECAUSE OF LOW WIND SPEEDS WHICH ARE MOSTLY UNDER THE MINIMUM REQUIREMENTS FOR OFFSHORE WIND FARMS AND HIGH COST OF INSTALLATION DUE TO HIGH DEPTHS OF WATER.
DESIGN OF THE TOWER IS ONE OF THE CHALLENGING TASKS BECAUSE THE NATURAL FREQUENCY OF THE TOWER MUST BE AS FAR AS POSSIBLE FROM ROTATIONAL SPEED OF THE ROTOR, OTHERWISE THE TOWER WILL START TO VIBRATE AND IF THE RESONANCE CONTINUES IT REINFORCES THE VIBRATION FINALLY CAUSING THE STRUCTURE TO BREAKDOWN. THE IMPORTANT PARAMETERS FOR DESIGN OF THE TOWER ARE THE RADIUS AND THE WALL THICKNESS AT THE BASE. THE INFLUENTIAL FACTORS THAT AFFECT THE DESIGN PARAMETERS ARE: BUCKLING OF THE SHELL WALL IN COMPRESSION, STRENGTH UNDER FATIGUE LOADING AND STIFFNESS REQUIREMENTS FOR ‘TUNING’ THE NATURAL FREQUENCY.
OFFSHORE WIND FARMS ARE USUALLY CONSTRUCTED IN SHALLOW WATERS CLOSE TO THE SHORE TO MINIMIZE THE MAINTENANCE AND GRID CONNECTION COSTS, BUT SOME DEEP WATER SITES ARE BEING INVESTIGATED.
THERE ARE SEVERAL OPTIONS FOR SHALLOW WATER AND DEEP WATER WIND TURBINE PLATFORMS SUCH AS SPAR BUOY, GRAVITY CAISSON, STEEL PILING, JACKET, ARTIFICIAL ISLAND, PONTOON AND MULTI-POD.
TYPICAL FIXED OFFSHORE PLATFORMS ARE RECOMMENDED FOR WATER DEPTHS UP TO 50 METRES. FOR WATER DEEPER THAN 60 METRES, THE MOST FEASIBLE OPTION IS A FLOATING WIND PLATFORM OR INSTALLATION ON EXISTING PETROLEUM OFFSHORE PLATFORMS. IN ORDER TO SUPPLY ELECTRICITY REQUIRED FOR OFFSHORE PLATFORMS (LIVING QUARTERS, PRODUCTION PLATFORMS, …), THE AUTHORS PROPOSE TO INSTALL SMALL WIND TURBINES OVER THE EXISTING PLATFORMS IN THE PERSIAN GULF (MORE THAN 300 PLATFORMS) PROVIDED THAT THE PLATFORMS RESISTANCE BE VERIFIED.

 
Keyword(s): OFFSHORE, WIND FARMS, RENEWABLE ENERGY, MERLIN INSTALLATION METHOD
 
 
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